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Old 16 September 2018, 11:07   #1
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4M Humber Rib Project

Hey guys,
We are new to the RIB scene and decided to take a project on,

We are hoping to get the boat on the water in month

The boat has cost 325 so far

75 for boat
75 for Engine (Honda 15hp 4stroke) was spairs and repair but fixed it
175 for trailer

we are trying to do the whole project for under 500
(Fingers crossed)

Pictures added below
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Old 16 September 2018, 11:09   #2
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Old 16 September 2018, 11:53   #3
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Good luck with it, looks like the transom is shot, you planning to replace it?
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Old 16 September 2018, 12:25   #4
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Good luck with it, looks like the transom is shot, you planning to replace it?

i have reinforced the transom with fiberglass 12mm plate on both sides and covered with Chopped strand matt, i drilled 20mm down and the wood is still dry , i hope this is strong enough , its was damp near the top though
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Old 16 September 2018, 12:28   #5
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Good luck with it, looks like the transom is shot, you planning to replace it?

i also put 4 studs in to hold it all together!
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Old 16 September 2018, 12:28   #6
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Old 16 September 2018, 13:06   #7
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You appear to have glassed over dirty gel coat, pretty much a pointless exercise.

I appreciate you want to get on the water but this may not be the way to go about it.
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Old 16 September 2018, 13:11   #8
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You appear to have glassed over dirty gel coat, pretty much a pointless exercise.

I appreciate you want to get on the water but this may not be the way to go about it.

first time doing this type of thing :S , the lamination looks / feels solid, no air bubbles or lifting
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Old 16 September 2018, 13:37   #9
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Without getting into a long explanation that can easily be found on Google, it will depend on what type of fibreglass resin was used, most boats and most fibreglass repair kits contain polyester resin, and most gelcoat is the same.

Whilst it is good practice to grind the gelcoat off to get back to the bare fibreglass to get the best adhesion, you can get away with good surface prep if both surfaces are polyester based due to how polyester bonds. I would always grind gelcoat off personally though, especially on a transom.

It may be okay in your shed but when 50kg of outboard is bouncing about on an unprepped surface, who can say?

Just be careful and enjoy your new boat safely
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Old 16 September 2018, 17:03   #10
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RIBase
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Originally Posted by Xk59D View Post
Without getting into a long explanation that can easily be found on Google, it will depend on what type of fibreglass resin was used, most boats and most fibreglass repair kits contain polyester resin, and most gelcoat is the same.

Whilst it is good practice to grind the gelcoat off to get back to the bare fibreglass to get the best adhesion, you can get away with good surface prep if both surfaces are polyester based due to how polyester bonds. I would always grind gelcoat off personally though, especially on a transom.

It may be okay in your shed but when 50kg of outboard is bouncing about on an unprepped surface, who can say?

Just be careful and enjoy your new boat safely
I ground the gelcoat off the deck on mines yesterday to get the new seats on half the street has a coating of yellow now used a 40 grit flap disc to get quite good results
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Old 17 September 2018, 15:31   #11
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Hi Curtis. What is that plate you put on transom?
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Old 18 September 2018, 06:14   #12
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That plate tells me it should not be having an engine strapped to it
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Old 18 September 2018, 06:29   #13
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The plate is extren 525 plate, 12mm thick, its strong as f.. I have orientated the fiber direction too when cutting to give more strength in different directions
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Old 18 September 2018, 15:46   #14
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At the very least you should’ve extended the plate across the transom to pick up the stainless supports.
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Old 18 September 2018, 16:11   #15
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If a transom is wet at the top. Gravity says itís most likely wet at the bottom. Any fix that doesnít remove the wood is probably a bodge. If it was me I would have removed inside skin of transom and fitted a new sheet of ply or ur grp board. Then 4-5 layers of 450 csm. However.

Letís be realistic. Itís a £500 boat and I doubt your gonna hang a 350hp off the back.

In an ideal world your repair, you would have ground back to bare grp, and then cleaned the area with acetone, then mixed resin with cabosil to create a thickened resin bog, to create a fillet between your board and transom. This big could be used to glue the board to the transom too.

(Alternatively you could have ground a taper on the board). Then either way you would have covered the whole transom area with csm to tie the board to the boat. Each layer of csm should get bigger and cover more area with poly resins, so you could have a clean up and carry on with this theme tbh

Another way would have been full width board so the stainless stringers bolted through the board. But you would have less original transom to tie the csm into.

Do you know if you have used polyester or vinylester or epoxy resin?
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Old 18 September 2018, 18:24   #16
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Loving this thread please keep the pics and info coming!
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Old 19 September 2018, 05:43   #17
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I like your thinking- get it on the water for a small investment and if you are enjoying it then comeback and tackle the transom again if need be. just tie the outboard onto the console just in case but the added safety of a rib is.....it should still float?

Maybe a cheap improvement may be to get some 18mm ply and replace the inner plate with one that goes all the way to the floor and then just laminate it to the floor and use your existing bolts as well. the first time you use it just get someone to watch the transom for obvious movement.

You could also take a 30-40mm hole saw to the centre of the transom and this will let you take a small core sample for inspection I guess somewhere on the centre line in half way/bottom third where it can be re-plugged and covered by the plywood.


Good luck with it and looking forward to seeing it go!
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Old 24 September 2018, 14:02   #18
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Originally Posted by gtflash View Post
If a transom is wet at the top. Gravity says itís most likely wet at the bottom. Any fix that doesnít remove the wood is probably a bodge. If it was me I would have removed inside skin of transom and fitted a new sheet of ply or ur grp board. Then 4-5 layers of 450 csm. However.

Letís be realistic. Itís a £500 boat and I doubt your gonna hang a 350hp off the back.

In an ideal world your repair, you would have ground back to bare grp, and then cleaned the area with acetone, then mixed resin with cabosil to create a thickened resin bog, to create a fillet between your board and transom. This big could be used to glue the board to the transom too.

(Alternatively you could have ground a taper on the board). Then either way you would have covered the whole transom area with csm to tie the board to the boat. Each layer of csm should get bigger and cover more area with poly resins, so you could have a clean up and carry on with this theme tbh

Another way would have been full width board so the stainless stringers bolted through the board. But you would have less original transom to tie the csm into.

Do you know if you have used polyester or vinylester or epoxy resin?


i have used polyester resin, and Aradite 2015 to bond plate to transom
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Old 24 September 2018, 14:04   #19
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update time,

Trailer has arrived at last , i need to adjust some of the rollers, trailer feels solid !

i am currently cleaning the tubes, its taking along time but we are slowly getting there!


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Old 24 September 2018, 14:08   #20
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I like your thinking- get it on the water for a small investment and if you are enjoying it then comeback and tackle the transom again if need be. just tie the outboard onto the console just in case but the added safety of a rib is.....it should still float?

Maybe a cheap improvement may be to get some 18mm ply and replace the inner plate with one that goes all the way to the floor and then just laminate it to the floor and use your existing bolts as well. the first time you use it just get someone to watch the transom for obvious movement.

You could also take a 30-40mm hole saw to the centre of the transom and this will let you take a small core sample for inspection I guess somewhere on the centre line in half way/bottom third where it can be re-plugged and covered by the plywood.


Good luck with it and looking forward to seeing it go!
hey thanks for the reply, i dug out all the rotten wood i found, i then filled the gap with CSM and polyester , it feels solid
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